// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/http/http_basic_state.h"

#include <utility>

#include "base/logging.h"
#include "net/base/io_buffer.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_body_drainer.h"
#include "net/http/http_stream_parser.h"
#include "net/http/http_util.h"
#include "net/socket/client_socket_handle.h"
#include "url/gurl.h"

namespace net {

HttpBasicState::HttpBasicState(ClientSocketHandle* connection, bool using_proxy)
    : read_buf_(new GrowableIOBuffer())
    , connection_(connection)
    , using_proxy_(using_proxy)
    , request_info_(NULL)
{
}

HttpBasicState::~HttpBasicState() { }

int HttpBasicState::Initialize(const HttpRequestInfo* request_info,
    RequestPriority priority,
    const BoundNetLog& net_log,
    const CompletionCallback& callback)
{
    DCHECK(!parser_.get());
    request_info_ = request_info;
    parser_.reset(new HttpStreamParser(
        connection_.get(), request_info, read_buf_.get(), net_log));
    return OK;
}

std::unique_ptr<ClientSocketHandle> HttpBasicState::ReleaseConnection()
{
    return std::move(connection_);
}

scoped_refptr<GrowableIOBuffer> HttpBasicState::read_buf() const
{
    return read_buf_;
}

void HttpBasicState::DeleteParser() { parser_.reset(); }

std::string HttpBasicState::GenerateRequestLine() const
{
    static const char kSuffix[] = " HTTP/1.1\r\n";
    const size_t kSuffixLen = arraysize(kSuffix) - 1;
    DCHECK(request_info_);
    const GURL& url = request_info_->url;
    const std::string path = using_proxy_ ? HttpUtil::SpecForRequest(url) : url.PathForRequest();
    // Don't use StringPrintf for concatenation because it is very inefficient.
    std::string request_line;
    const size_t expected_size = request_info_->method.size() + 1 + path.size() + kSuffixLen;
    request_line.reserve(expected_size);
    request_line.append(request_info_->method);
    request_line.append(1, ' ');
    request_line.append(path);
    request_line.append(kSuffix, kSuffixLen);
    DCHECK_EQ(expected_size, request_line.size());
    return request_line;
}

} // namespace net
